Try to speed up build

.travis.yml

@@ -31,9 +31,6 @@ node_js:
 matrix:
   include:
     - node_js: 7
-      script: yarn run test:visual:run --no-clean
-
-# Install a C++11 compatible compiler
       addons:
         apt:
           sources:
@@ -41,10 +38,10 @@ addons:
           packages:
             - gcc-4.8
             - g++-4.8
-
-# Set C++ compiler as default
       env:
         - CXX=g++-4.8
+      install: yarn install
+      script: yarn run test:visual:run --no-clean
 
 # Limit clone depth to 5, to speed up build
 git:
@@ -57,6 +54,9 @@ cache:
   directories:
     - node_modules
 
+# Do not install optional dependencies by default
+install: yarn install --ignore-optional
+
 # Install dependencies
 before_script:
   - pip install --user -r requirements.txt

package.json

@@ -51,7 +51,6 @@
     "eslint": "^3.14.0",
     "eslint-plugin-mocha": "^4.8.0",
     "fastclick": "^1.0.6",
-    "gemini": "^4.14.3",
     "git-hooks": "^1.1.7",
     "gulp": "^3.9.1",
     "gulp-changed": "^1.3.2",
@@ -90,8 +89,6 @@
     "moniker": "^0.1.2",
     "node-notifier": "^5.0.0",
     "postcss-pseudo-classes": "^0.1.0",
-    "sauce-connect-launcher": "^1.2.0",
-    "selenium-standalone": "^6.0.0",
     "stylelint": "^7.8.0",
     "stylelint-config-standard": "^16.0.0",
     "stylelint-order": "^0.2.2",
@@ -103,6 +100,11 @@
     "whatwg-fetch": "^2.0.1",
     "yargs": "^6.6.0"
   },
+  "optionalDependencies": {
+    "gemini": "^4.14.3",
+    "sauce-connect-launcher": "^1.2.0",
+    "selenium-standalone": "^6.0.0"
+  },
   "engines": {
     "node": ">= 4.5.0"
   },

tests/visual/config/gemini.sauce-connect.json

@@ -9,7 +9,8 @@
         "platform": "Windows 10",
         "screenResolution": "1280x1024",
         "recordVideo": "false"
-      }
+      },
+      "retry": 1
     },
     "firefox": {
       "desiredCapabilities": {
@@ -18,7 +19,8 @@
         "platform": "Windows 10",
         "screenResolution": "1280x1024",
         "recordVideo": "false"
-      }
+      },
+      "retry": 1
     },
     "edge": {
       "desiredCapabilities": {
@@ -26,7 +28,8 @@
         "platform": "Windows 10",
         "screenResolution": "1280x1024",
         "recordVideo": "false"
-      }
+      },
+      "retry": 1
     },
     "ie11": {
       "desiredCapabilities": {
@@ -35,7 +38,8 @@
         "platform": "Windows 10",
         "screenResolution": "1280x1024",
         "recordVideo": "false"
-      }
+      },
+      "retry": 1
     },
     "ie10": {
       "desiredCapabilities": {
@@ -44,7 +48,8 @@
         "platform": "Windows 8",
         "screenResolution": "1280x1024",
         "recordVideo": "false"
-      }
+      },
+      "retry": 1
     }
   },
   "system": {